An invalid device was specified. The specified device
does not exist or has not been opened by this client via XOpenInputDevice.
This error may also occur if some other client has caused the specified
device to become the X keyboard or X pointer device via the XChangeKeyboardDevice
or XChangePointerDevice requests.

BadMatch

This error may occur if an XGetDeviceControl
request was made specifying a device that has no controls or an XChangeDeviceControl
request was made with an XDeviceControl structure that contains an invalid
Device type. It may also occur if an invalid combination of mask bits is
specified (DvKey but no DvAutoRepeatMode for keyboard Devices), or if an
invalid KeySym is specified for a string Device.

BadValue

Some numeric
value falls outside the range of values accepted by the XChangeDeviceControl
request. Unless a specific range is specified for an argument, the full
range defined by the argument's type is accepted. Any argument defined as
a set of alternatives can generate this error.